There seems to be an awful lot of sites going on about how to use Powerpoint more effectively at the moment (no links - you'll have seen them already if you are interested in this kind of stuff). I'm sure that much of what is said is good, but everything I've seen seems to be geared for people selling things or presenting business ideas. Nothing about teaching people stuff at all : I'm sure all the writers will say "Oh it's just the same", but it isn't obvious to me that it is. Maybe I need to see a powerpoint presentation that explains it all to me.